A suicide bomber struck Sunday outside a college campus in Baghdad, killing at least 31 and wounding dozens as a string of other blasts and rocket attacks left bloodshed around the capital. Most of the victims near the College of Business Administration and Economics were students, police said, according to the AP. At least 42 people were injured.

Earlier, two rockets landed in a Shiite enclave in southern Baghdad on Sunday, killing at least 10 people, while two people died in a blast near the heavily protected Green Zone, police said. Other sources said no more than three people had been wounded.

The Katyusha rockets hit Abu Dishir, a Shiite area surrounded Sunni neighborhood, during the busy morning shopping hours. Earlier, a bomb went off near the fortified Green Zone. The blast was about 100 yards from the Iranian Embassy.

Another car bomb went off along a commercial street in central Baghdad, in the Karrada district, Reuters reported. One police source said four people were hurt while another said there were no casualties.

The attacks came following an exchange of artillery and mortar fire between American forces and Sunni fighters south of the capital. In the northern city of Mosul, American forces killed two gunmen in a raid and captured a suspected local leader of al-Qaeda in Iraq, the US military said.

Meanwhile, Iraq's interior ministry, , raised the toll from a suicide truck bombing in the Anbar province on Saturday to 40 dead and 65 wounded.